Theoretical Design of Experimental Set Up For Pulsating Turbulent Flow In Pipe For Heat Transfer Application

Enhancement of heat transfer in a tube is a remarkable engineering achievement as it has the potential to reduce power consumptions of industrial heat exchangers significantly. Consequently, the power demand of industry would be reduced; lowering the need for excessive amounts of power and decreasing harmful emissions to the environment by power generators the enhancement and determination of pipe wall convective heat transfer characteristics has likely been one of the most interesting engineering aspects of heat transfer research. Different methods to enhance the heat transfer coefficient were developed. Thinking of such notion, one such technique that has been widely used in industry is the use of flow pulsation in the tube. There are many engineering practical situations where heat is being transferred under conditions of pulsating and reciprocating flows such as the operation of modern power producing facilities and industrial equipment used in metallurgy, aviation, chemical and food technology. The performance of this equipment in thermal engineering applications is affected by the pulsating flow parameters. Pulsating flows can be produced by reciprocating pump or by steady flow pump together with some mechanical pulsating devices. It may normally be expected that the heat transfer to or from the flow would be changed since the pulsation would alter the thickness of the boundary layer and hence the thermal resistance. The objective of the present work is to design experimental set up for application of the heat transfer characteristics of pulsatile turbulent flow in a pipe. This set up considers the effect of pulsation frequency, location of pulsation mechanism on the heat transfer characteristics in pulsatile flow. At the same time pulsating flow visualization with smoke generation has been done. The effect of flow pulsation on average and local heat transfer coefficient will be considered in design. This design shows the effect of pulsation frequency on local heat transfer coefficient. Heat transfer coefficient relates with nusselt number. So design is useful to account nusselt number in terms of heat transfer coefficient. This design also locates position of the pulsation mechanism in order to increase the average heat transfer coefficient. It also predicts approximate nusselt number at which maximum enhancement occurs.